FAR 52.232-25
Prompt Payment
What it says
Implements the Prompt Payment Act: the government generally must pay a proper invoice within 30 days of receipt (or acceptance, whichever governs) and owes interest automatically on late payments.
Why it matters on DIBBS
Sets your baseline cash-flow expectation on any award without fast pay: roughly 30 days after a clean invoice in WAWF/PIEE. Invoice errors restart the clock — get the paperwork right the first time.